When I was 4-15 years old I used to self-insert all the time when I could create a character, like a perfect future version of me with my name.
In Skyrim I was myself, the invincible super cool and strong warrior. In The Sims 2/3 I was myself, the richest and most beautiful man on earth lol
Now these days I can really create myself in games (kinda, can't really be accurate because some of my facial features don't exist according to some games) and I can even put my real height in NBA 2K and play a meta build. But I never do because it's more fun to create random guys with a lore invented in 5 seconds, I used to always play male human now I don't.
Now If we talk self-insert in games with no character creation and with story choices like The Witcher 1/2/3 I prefer chosing the lore-accurate choices